name_combo.connect("changed", self.on_name_combo_changed)

def on_name_combo_changed(self, combo):
    """
    Function for work with combo
    :param combo: control ComboBox
    :return:
    """
    tree_iter = combo.get_active_iter()
    if tree_iter != None:
        model = combo.get_model()
        row_id, name = model[tree_iter][:2]
        print("Selected: ID=%d, name=%s" % (row_id, name))
    else:
        entry = combo.get_child()
        print("Entered: %s" % entry.get_text())